gecko-dev/js/public/OffThreadScriptCompilation.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Types and functions related to the compilation of JavaScript off the
* direct JSAPI-using thread.
*/
#ifndef js_OffThreadScriptCompilation_h
#define js_OffThreadScriptCompilation_h
#include "mozilla/Range.h" // mozilla::Range
#include "mozilla/Vector.h" // mozilla::Vector
#include <stddef.h> // size_t
#include "jstypes.h" // JS_PUBLIC_API
#include "js/CompileOptions.h" // JS::ReadOnlyCompileOptions
#include "js/GCVector.h" // JS::GCVector
#include "js/Transcoding.h" // JS::TranscodeSource
struct JSContext;
class JSScript;
namespace JS {
template <typename UnitT>
class SourceText;
} // namespace JS
namespace JS {
class OffThreadToken;
using OffThreadCompileCallback = void (*)(OffThreadToken* token,
void* callbackData);
extern JS_PUBLIC_API bool CanCompileOffThread(
JSContext* cx, const ReadOnlyCompileOptions& options, size_t length);
extern JS_PUBLIC_API bool CanDecodeOffThread(
JSContext* cx, const ReadOnlyCompileOptions& options, size_t length);
/*
* Off thread compilation control flow.
*
* After successfully triggering an off thread compile of a script, the
* callback will eventually be invoked with the specified data and a token
* for the compilation. The callback will be invoked while off thread,
* so must ensure that its operations are thread safe. Afterwards, one of the
* following functions must be invoked on the runtime's main thread:
*
* - FinishOffThreadScript, to get the result script (or nullptr on failure).
* - CancelOffThreadScript, to free the resources without creating a script.
*
* The characters passed in to CompileOffThread must remain live until the
* callback is invoked, and the resulting script will be rooted until the call
* to FinishOffThreadScript.
*/
extern JS_PUBLIC_API bool CompileOffThread(
JSContext* cx, const ReadOnlyCompileOptions& options,
SourceText<char16_t>& srcBuf, OffThreadCompileCallback callback,
void* callbackData);
extern JS_PUBLIC_API JSScript* FinishOffThreadScript(JSContext* cx,
OffThreadToken* token);
extern JS_PUBLIC_API void CancelOffThreadScript(JSContext* cx,
OffThreadToken* token);
extern JS_PUBLIC_API bool CompileOffThreadModule(
JSContext* cx, const ReadOnlyCompileOptions& options,
SourceText<char16_t>& srcBuf, OffThreadCompileCallback callback,
void* callbackData);
extern JS_PUBLIC_API JSObject* FinishOffThreadModule(JSContext* cx,
OffThreadToken* token);
extern JS_PUBLIC_API void CancelOffThreadModule(JSContext* cx,
OffThreadToken* token);
extern JS_PUBLIC_API bool DecodeOffThreadScript(
JSContext* cx, const ReadOnlyCompileOptions& options,
mozilla::Vector<uint8_t>& buffer /* TranscodeBuffer& */, size_t cursor,
OffThreadCompileCallback callback, void* callbackData);
extern JS_PUBLIC_API bool DecodeOffThreadScript(
JSContext* cx, const ReadOnlyCompileOptions& options,
const mozilla::Range<uint8_t>& range /* TranscodeRange& */,
OffThreadCompileCallback callback, void* callbackData);
extern JS_PUBLIC_API JSScript* FinishOffThreadScriptDecoder(
JSContext* cx, OffThreadToken* token);
extern JS_PUBLIC_API void CancelOffThreadScriptDecoder(JSContext* cx,
OffThreadToken* token);
extern JS_PUBLIC_API bool DecodeMultiOffThreadScripts(
JSContext* cx, const ReadOnlyCompileOptions& options,
mozilla::Vector<TranscodeSource>& sources,
OffThreadCompileCallback callback, void* callbackData);
extern JS_PUBLIC_API bool FinishMultiOffThreadScriptsDecoder(
JSContext* cx, OffThreadToken* token,
MutableHandle<GCVector<JSScript*>> scripts);
extern JS_PUBLIC_API void CancelMultiOffThreadScriptsDecoder(
JSContext* cx, OffThreadToken* token);
#if defined(JS_BUILD_BINAST)
extern JS_PUBLIC_API bool CanDecodeBinASTOffThread(
JSContext* cx, const ReadOnlyCompileOptions& options, size_t length);
#endif // defined(JS_BUILD_BINAST)
} // namespace JS
#endif /* js_OffThreadScriptCompilation_h */